title: Time to pregnancy among women with rheumatoid arthritis.
abstract: OBJECTIVE
  To assess whether onset of rheumatoid arthritis (RA) prior to conception is associated with a delayed time to pregnancy (TTP).
  
  
  METHODS
  The study included pregnant women from across Denmark who enrolled in the Danish National Birth Cohort between 1996 and 2002 and had planned or partly planned the cohort pregnancy. RA diagnosis was identified using the Danish National Hospital Discharge Registry. Self-reported data, including TTP, maternal age, parity, prepregnancy height and weight, maternal occupational status, smoking, and alcohol consumption, were collected using a detailed computer-assisted telephone interview at ∼16 weeks of gestation. We used logistic regression analyses as well as a complementary log regression model to examine whether TTP was influenced by RA, adjusting for the abovementioned variables.
  
  
  RESULTS
  Overall, compared with women with no recorded RA (n=74,255), women with prevalent RA (onset prior to conception) (n=112) were slightly older (mean±SD age 30.8±4.3 years versus 29.7±4.1 years), were more likely to have been treated for infertility (9.8% versus 7.6%), and were more likely to have taken>12 months to conceive (25.0% versus 15.6%). The association between RA and TTP was borderline significant after adjusting for covariates in the regression analyses (odds ratio 1.6 [95% confidence interval 1.0-2.4]). Similar results were obtained after restricting the analyses to women who had planned the pregnancy or those who were nulliparous before the cohort pregnancy.
  
  
  CONCLUSIONS
  Women with RA onset prior to conception had a slightly longer TTP compared with those who did not have RA, indicating a slight reduction in fecundity.
authors.affiliation: Children's Hospital Oakland Research Institute, Oakland, California 94609, USA. djawaheer@chori.org
authors.forename: Damini
authors.initials: D
authors.lastname: Jawaheer
authors.forename: Jin Liang
authors.initials: JL
authors.lastname: Zhu
authors.forename: Ellen A
authors.initials: EA
authors.lastname: Nohr
authors.forename: Jørn
authors.initials: J
authors.lastname: Olsen
mesh_terms: D000328:Adult; D000428:Alcohol Drinking / Q000453:epidemiology; D001172:Arthritis, Rheumatoid / Q000150:complications* / Q000453:epidemiology; D015331:Cohort Studies; D003718:Denmark / Q000453:epidemiology; D004651:Employment / Q000706:statistics & numerical data; D005260:Female; D005306:Fertilization; D006801:Humans; D007247:Infertility, Female / Q000453:epidemiology / Q000209:etiology*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000503:physiopathology*; D012907:Smoking / Q000453:epidemiology